The electronic configurations of bivalent europium and trivalent cerium are
(atomic number : $Xe=54, Ce=58, Eu=63$ )
(atomic number : $Xe=54, Ce=58, Eu=63$ )
- A$[Xe] 4f^{4}$ and $[Xe] 4f^{9}$
- B$[Xe] 4f^{7}$ and $[Xe] 4f^{1}$
- C$[Xe] 4f^{7} 6s^{2}$ and $[Xe] 4f^{2} 6s^{2}$
- D$[Xe] 4f^{2}$ and $[Xe] 4f^{7}$
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